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WO1998020400A2 - Circuit pour adapter le courant d'un circuit de commande de soupape au courant requis pour actionner la soupape - Google Patents

Circuit pour adapter le courant d'un circuit de commande de soupape au courant requis pour actionner la soupape Download PDF

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Publication number
WO1998020400A2
WO1998020400A2 PCT/EP1997/005807 EP9705807W WO9820400A2 WO 1998020400 A2 WO1998020400 A2 WO 1998020400A2 EP 9705807 W EP9705807 W EP 9705807W WO 9820400 A2 WO9820400 A2 WO 9820400A2
Authority
WO
WIPO (PCT)
Prior art keywords
current
valve
circuit arrangement
coils
switched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP1997/005807
Other languages
German (de)
English (en)
Other versions
WO1998020400A3 (fr
Inventor
Olaf Zinke
Mario Engelmann
Wolfgang Fey
Michael Zydek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITT Manufacturing Enterprises LLC
Original Assignee
ITT Manufacturing Enterprises LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ITT Manufacturing Enterprises LLC filed Critical ITT Manufacturing Enterprises LLC
Publication of WO1998020400A2 publication Critical patent/WO1998020400A2/fr
Publication of WO1998020400A3 publication Critical patent/WO1998020400A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force

Definitions

  • Circuit arrangement for adapting the current of a valve driver to the current required to actuate the valve
  • the invention relates to a circuit arrangement for adapting the current of a valve driver to the current required to actuate the valve, the valve being actuated electromagnetically by supplying current to a valve coil.
  • valves of a blocking-slotted brake system are switched electromagnetically in a motor vehicle.
  • the switching is carried out by means of transistors which, when switched on, allow current to flow through a valve coil. Since this application is a safety-relevant function, the transistor and valve coil must be designed so that the valve can be switched even under unfavorable conditions.
  • Unfavorable conditions can, for example, be that the vehicle electrical system voltage has dropped.
  • unfavorable conditions can be that the valve coil has heated up and, as a result, its ohmic resistance is correspondingly high.
  • the present invention is therefore based on the object of solving problems associated with the occurrence of power loss.
  • this object is achieved by providing a plurality of valve coils for actuating the valve, which can be supplied with current individually or in groups.
  • the power which is consumed when the valve is actuated can advantageously be adapted to the power which is required to actuate the valve. This means that savings can be made with regard to the measures of heat dissipation. Overall, this results in the possibility of providing higher integration of the components on a chip.
  • the invention can be used particularly advantageously in a motor vehicle.
  • fluctuations in the vehicle electrical system voltage can be compensated for, as Changes in the valve coils as a result of temperature changes that can occur especially in the motor vehicle and there in particular in the valves of anti-lock brake systems.
  • a minimum current is set which is required to actuate the valve. Furthermore, all valve coils are initially supplied with current, a measurement of the current is then used to infer the flowing current, this value of the current is compared to the minimum current and the current through one or more valve coils is switched off depending on the extent to which the value of the flowing Current exceeds the minimum current.
  • the circuit arrangement according to claim 4 has two valve coils, the windings of which are wound on the same winding support.
  • valve coil arrangement is easy to manufacture.
  • a conclusion is drawn from a measurement of the current through one of the valve coils on the flowing current, the measurement of the current in the valve coil taking place at a Current application for actuating the valve is switched on first or last switched off.
  • valve coils are switched on and off by means of semiconductor switches such as transistors.
  • the reduction in power loss has a particularly advantageous effect here, since the integration density on the chip can thereby be increased. For example, a larger number of valve driver stages, that is to say a plurality of semiconductor switches, can take place on one chip. Smaller and cheaper housings can also be used. The routing within the circuit housing and the routing on the circuit board are also simplified. This affects, for example, the size of the pads on the chip, the cross-section and the number of bonding wires, and the cross-section of the circuit pins.
  • Fig. 1 shows the current conditions in a valve coil for actuating a valve.
  • Curves 1, 2 and 3 have in common that the current only rises to its maximum value after a certain time delay after the semiconductor switch has been switched. This is due to the fact that the inductance of the valve coil counteracts a current rise in the start-up phase.
  • Reference number 4 shows a dashed line, which represents the minimum current that must flow in order to enable actuation of the valve.
  • Curve 3 thus shows the current profile under the most unfavorable conditions that usually occur.
  • the current after the start-up time is just above the minimum current 4.
  • the value of the ohmic resistance of the valve coil and other resistance values such as, for example, along the switching path of the semiconductor switch must be coordinated so that the current 3 is still above the worst case Minimum current 4 is.
  • Curve 1 shows the current that can be set as a maximum in the design according to curve 3. This can happen, for example, if the vehicle electrical system voltage assumes equally large values and the valve coil is comparatively cold, so that its ohmic resistance is correspondingly low.
  • Fig. 2 shows a circuit arrangement which is already known to the applicant.
  • the valve coil 5 of the valve is switched on and off via the transistor 6.
  • the maximum current flowing through the valve coil 5 and the transistor 6 in the switched-on state is dependent on the operating voltage Vcc, on the ohmic resistance s pu i e5 of the valve coil winding and on the on-state resistance R KE6 of the transistor 6 between the collector and emitter in the switched-on state.
  • the valve coil 5 is dimensioned in terms of its magnetic properties, the winding wire cross-section and the number of turns in such a way that at the lowest available operating voltage Vcc a sufficiently large current flows through the valve to ensure the valve function. Since the operating voltage, which essentially corresponds to the vehicle electrical system voltage, and the ohmic resistance R Spu i e5 are subject to very large fluctuations curve curves corresponding to curves 1 to 3 of FIG. 1. The fluctuations in the ohmic resistance R coil5 are essentially based on the change in resistance with temperature.
  • FIG. 3 shows a circuit arrangement according to the present invention.
  • two valve coils 7 and 9 are provided in FIG. 3. These two valve coils 7 and 9 also each have n turns, as does the valve coil 5, but their ohmic resistance Rs pu i e7 and R s pu i e9 are each twice as great as the ohmic resistance Rs pu i e5 of the valve coil 5.
  • the two windings of the valve coils 7 and 9 are advantageously identical. These two windings can be bifilar wound on a winding body or on two separate winding bodies located one behind the other.
  • the two valve coils 7 and 9 are switched by separate driver transistors 8 and 10. These driver transistors 8 and 10 can be switched on and off individually.
  • the two transistors 8 and 10 When integrated on an IC chip, the two transistors 8 and 10 take up the same area as the transistor 6 according to the circuit example in FIG. 2. As a result, the on- resistance R KE8 and R KEIO of each of these transistors 8 and 10 is twice as large like the on resistance R KE6 of the transistor 6.
  • both valve coils 7 and 9 In order to ensure a safe and fast response of the valve, current is first applied to both valve coils 7 and 9 by switching both driver transistors 8 and 10 through. In the embodiment according to FIG. 3, the further sequence is particularly simple because both valve coils are identical. It is checked in the next step whether the current flow exceeds twice the value of the minimum current 4 according to FIG. 1. In this case, reliable functioning of the valve is ensured even if one of the two valve coils 7 or 9 is switched off. The transistor 8 is switched off, for example, by means of a corresponding control circuit. After a decay phase in which the current through the valve coil 7 drops to "0", only current flows through the valve coil 9. This current is greater than the minimum current 4 according to FIG. 1. The current is advantageously measured in order to switch on the second valve coil 7 again when the current drops below the minimum current 4.
  • the power loss P 2 was :
  • the power loss P 3 in the driver stage is at 3 with the valve coil 9 switched on:
  • R REIO is twice as large as R RE6 an d R s pu i e9 is twice as large as R Spule5 ri st power dissipation in the circuit arrangement of Fig. 3 with respect to the circuit of Fig. 2 is reduced to half, when only one the valve coils 7 and 9 is switched on.
  • the current can be measured in a manner known per se. If necessary, the current can be measured in one of the two windings.
  • this is the winding that is energized in each case when the valve is actuated, since the current can then be measured continuously, and thus the other valve coil can also be switched on again when the current drops.
  • the measurement method here is the measurement of the voltage drop via an ohmic shunt, the current level measurement of the current in the driver transistor or a brief redirection of the current via an external resistor, combined with a measurement of the voltage drop. The last-mentioned method is explained, for example, in the patent application ....
  • FIG. 4 shows the configuration of a circuit arrangement in which the current measurement in the circuit of the valve coil 9 takes place by means of the shunt resistor 11. Identical components for the circuit arrangement according to FIG. 3 are provided with the same reference symbols.
  • the valve driver stage is switched on and off by means of the signal ON switched off.
  • the driver transistor 10 is switched directly by means of this signal.
  • a reference voltage is applied to one input 13 of the comparator 12.
  • the voltage which is to be measured by means of the shunt resistor 11 is applied to the other input 14 of the comparator 12 in order to determine the current.
  • the reference voltage is designed so that the voltage drop across the shunt resistor 11 corresponds to a current in the branch of the valve coil 9 which corresponds to the minimum current 4 according to FIG. 1.
  • This output signal like the signal "ON", is fed to an AND gate 15. Immediately after switching on, the output signal of this AND gate 15 is also at "1". This output signal is fed to transistor 8, which is therefore also switched on.
  • valve coils 7 and 9 are initially supplied with current when switched on.
  • the device is switched off by setting the ON signal to "0".
  • the transistor 10 switches off immediately. Since the ON signal is also fed to an input of the AND gate 15, its output signal also goes to "0", so that the transistor 8 also switches off.
  • FIG. 5 shows a curve 16 which shows the valve current through the valve coil 5 in the circuit arrangement according to FIG. 2. Furthermore, FIG. 5 shows a curve 17 which shows the total current through both valve coils 7 and 9 in the circuit arrangement according to FIG. 3 or FIG. 4. It can be clearly seen that the total current is reduced and thus the power loss that has to be dissipated is lower.
  • valve coil 9 further shows a curve 18 which corresponds to the current profile through the valve coil 9. This valve coil is not switched off to reduce power loss.
  • FIG. 7 shows a curve 19 which corresponds to the current profile if the valve coil 7 would not be switched off.
  • Curve 20 shows the current profile through the valve coil 7 with a shutdown of this valve coil 7 to reduce the power loss.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un circuit pour adapter le courant d'un circuit de commande de soupape au courant requis pour actionner la soupape. Ladite soupape est à actionnement électromagnétique du fait qu'une bobine de soupape est sollicitée par du courant. Pour actionner la soupape, il est prévu des bobines de soupape pouvant être sollicitées individuellement ou en groupes par du courant.
PCT/EP1997/005807 1996-11-04 1997-10-21 Circuit pour adapter le courant d'un circuit de commande de soupape au courant requis pour actionner la soupape Ceased WO1998020400A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19645323.2 1996-11-04
DE1996145323 DE19645323A1 (de) 1996-11-04 1996-11-04 Schaltungsanordnung zur Anpassung des Stromes eines Ventiltreibers an den benötigten Strom zur Betätigung des Ventiles

Publications (2)

Publication Number Publication Date
WO1998020400A2 true WO1998020400A2 (fr) 1998-05-14
WO1998020400A3 WO1998020400A3 (fr) 1998-07-23

Family

ID=7810553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/005807 Ceased WO1998020400A2 (fr) 1996-11-04 1997-10-21 Circuit pour adapter le courant d'un circuit de commande de soupape au courant requis pour actionner la soupape

Country Status (2)

Country Link
DE (1) DE19645323A1 (fr)
WO (1) WO1998020400A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937475A1 (de) * 1999-08-07 2001-02-08 Continental Teves Ag & Co Ohg Vorrichtung und Verfahren zum Steuern einer hydraulischen Bremsanlage

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498329A (en) * 1967-10-12 1970-03-03 Delta Hydraulics Co Servo valve
CH523583A (fr) * 1971-04-23 1972-05-31 Lucifer Sa Dispositif de commande d'un électro-aimant
DE2809905C2 (de) * 1978-03-08 1983-08-04 Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Relais-Halteschaltung
FR2590088B1 (fr) * 1985-11-12 1988-10-28 Leroux Gilles Verin electromagnetique a haute rapidite
KR900009058B1 (ko) * 1987-02-25 1990-12-17 미쓰비시전기 주식회사 전자 스위치 장치
DE9208271U1 (de) * 1992-06-20 1992-09-03 H. Kuhnke Gmbh Kg, 23714 Malente Betätigungsmagnet
US5377068A (en) * 1992-10-19 1994-12-27 Predator Systems Inc. Electromagnet with holding control
US5347419A (en) * 1992-12-22 1994-09-13 Eaton Corporation Current limiting solenoid driver
DE4426021A1 (de) * 1994-07-22 1996-01-25 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung eines elektromagnetischen Verbrauchers
US5510951A (en) * 1994-08-01 1996-04-23 Eaton Corporation Electronic control for 3-wire DC coils
DE19539071A1 (de) * 1995-03-02 1996-09-05 Bosch Gmbh Robert Vorrichtung zur Ansteuerung wenigstens eines elektromagnetischen Verbrauchers
US5568349A (en) * 1995-04-04 1996-10-22 Motorola, Inc. Apparatus and method for controlling a relay device

Also Published As

Publication number Publication date
DE19645323A1 (de) 1998-05-07
WO1998020400A3 (fr) 1998-07-23

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